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First draft of stack slot loads / stores lowering

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-05-03 13:09:57 +00:00
parent cf14ae5500
commit aa29915b58
5 changed files with 80 additions and 4 deletions
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40
lib/Target/MSP430/MSP430InstrInfo.cpp
View File

@ -16,10 +16,10 @@
#include "MSP430TargetMachine.h"
#include "MSP430GenInstrInfo.inc"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
using namespace llvm;
@ -27,6 +27,42 @@ MSP430InstrInfo::MSP430InstrInfo(MSP430TargetMachine &tm)
: TargetInstrInfoImpl(MSP430Insts, array_lengthof(MSP430Insts)),
RI(tm, *this), TM(tm) {}
void MSP430InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIdx,
const TargetRegisterClass *RC) const {
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, false, false, isKill);
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, false, false, isKill);
else
assert(0 && "Cannot store this register to stack slot!");
}
void MSP430InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const{
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16rm))
.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8rm))
.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
else
assert(0 && "Cannot store this register to stack slot!");
}
bool MSP430InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DestReg, unsigned SrcReg,

9
lib/Target/MSP430/MSP430InstrInfo.h
View File

@ -41,6 +41,15 @@ public:
bool isMoveInstr(const MachineInstr& MI,
unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIndex,
const TargetRegisterClass *RC) const;
virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const;
};
}

32
lib/Target/MSP430/MSP430RegisterInfo.cpp
View File

@ -74,6 +74,11 @@ MSP430RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
return Reserved;
}
const TargetRegisterClass* MSP430RegisterInfo::getPointerRegClass() const {
return &MSP430::GR16RegClass;
}
bool MSP430RegisterInfo::hasFP(const MachineFunction &MF) const {
return NoFramePointerElim || MF.getFrameInfo()->hasVarSizedObjects();
}
@ -143,7 +148,32 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
void
MSP430RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, RegScavenger *RS) const {
assert(0 && "Not implemented yet!");
assert(SPAdj == 0 && "Unexpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
while (!MI.getOperand(i).isFI()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
int FrameIndex = MI.getOperand(i).getIndex();
unsigned BasePtr = (hasFP(MF) ? MSP430::FPW : MSP430::SPW);
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
if (!hasFP(MF))
Offset += MF.getFrameInfo()->getStackSize();
// Skip the saved PC
Offset += 2;
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Fold imm into offset
Offset += MI.getOperand(i+1).getImm();
MI.getOperand(i+1).ChangeToImmediate(Offset);
}
void MSP430RegisterInfo::emitPrologue(MachineFunction &MF) const {

1
lib/Target/MSP430/MSP430RegisterInfo.h
View File

@ -40,6 +40,7 @@ public:
getCalleeSavedRegClasses(const MachineFunction *MF = 0) const;
BitVector getReservedRegs(const MachineFunction &MF) const;
const TargetRegisterClass* getPointerRegClass() const;
bool hasFP(const MachineFunction &MF) const;
bool hasReservedCallFrame(MachineFunction &MF) const;

2
lib/Target/MSP430/MSP430TargetMachine.cpp
View File

@ -41,7 +41,7 @@ MSP430TargetMachine::MSP430TargetMachine(const Module &M,
// FIXME: Check TargetData string.
DataLayout("e-p:16:8:8-i8:8:8-i16:8:8-i32:8:8"),
InstrInfo(*this), TLInfo(*this),
FrameInfo(TargetFrameInfo::StackGrowsUp, 8, 0) { }
FrameInfo(TargetFrameInfo::StackGrowsDown, 8, 0) { }
const TargetAsmInfo *MSP430TargetMachine::createTargetAsmInfo() const {
return new MSP430TargetAsmInfo(*this);